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TODO
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planned incompatible changes in 0.8.x:
* (not done yet, but planned:) When the profiling interface settles
down, it might impact TRACE. They both encapsulate functions, and
it's not clear yet how e.g. UNPROFILE will interact with TRACE
and UNTRACE. (This shouldn't matter, though, unless you are using
profiling. If you never profile anything, TRACE should continue to
behave as before.)
* (not done yet, but planned:) Inlining can now be controlled the
ANSI way, without MAYBE-INLINE, since the idiom
(DECLAIM (INLINE FOO))
(DEFUN FOO (..) ..)
(DECLAIM (NOTINLINE FOO))
(DEFUN BAR (..) (FOO ..))
(DEFUN BLETCH (..) (DECLARE (INLINE FOO)) (FOO ..))
now does what ANSI says it should. The CMU-CL-style
SB-EXT:MAYBE-INLINE declaration is now deprecated and ignored.
for early 0.8.x:
* test file reworking
** ports with less than 256Mb of heap (sparc, ppc and mips)
now don't fail bit-vector.impure-cload.lisp
* faster bootstrapping (both make.sh and slam.sh)
** added mechanisms for automatically finding dead code, and
used them to remove dead code
** moved stuff from warm init into cold init where possible
(so that slam.sh will run faster and also just because
ideally everything would be in cold init)
** profiled and tweaked
* fixed (TRACE :REPORT PROFILE ...) interface to profiling
* more EVAL/EVAL-WHEN/%COMPILE/DEFUN/DEFSTRUCT cleanup:
** made %COMPILE understand magicality of DEFUN FOO
w.r.t. e.g. preexisting inlineness of FOO
** used %COMPILE where COMPILE-TOP-LEVEL used to be used
** removed now-redundant COMPILE-TOP-LEVEL and
FUNCTIONAL-KIND=:TOP-LEVEL stuff from the compiler
** (ideally, but perhaps too hard, given what I've discovered
about the godawful internals of function debug names):
made FUNCTION-NAME logic work on closures, so that
various public functions like CL:PACKAGEP which
are now implemented as closures (because
they're structure slot accessors) won't be so
nasty in the debugger
* outstanding embarrassments
** :IGNORE-ERRORS-P cruft in stems-and-flags.lisp-expr. (It's
reasonable to support this as a crutch when initially
bootstrapping from balky xc hosts with their own
idiosyncratic ideas of what merits FAILURE-P, but it's
embarrassing to have to use it when bootstrapping
under SBCL!),
* fixups now feasible because of pre7 changes
** ANSIfied DECLAIM INLINE stuff (deprecating MAYBE-INLINE,
including e.g. on the man page)
** (maybe) allow INLINE of a recursive function, so that the
body is inlined once
* miscellaneous simple refactoring
* belated renaming:
** renamed %PRIMITIVE to %VOP
** A few hundred things named FN and FCN should be
named FUN (but maybe not while drichards is
working on a Windows port).
* These days ANSI C has inline functions, so..
** redid many cpp macros as inline functions:
HeaderValue, Pointerp, CEILING, ALIGNED_SIZE,
GET_FREE_POINTER, SET_FREE_POINTER,
GET_GC_TRIGGER, SET_GC_TRIGGER, GetBSP, SetBSP,
os_trunc_foo(), os_round_up_foo()
** removed various avoid-evaluating-C-macro-arg-twice
cruft
* Either get rid of or at least rework the fdefinition/encapsulation
system so that (SYMBOL-FUNCTION 'FOO) is identically equal to
(FDEFINITION 'FOO).
* Make the system sources understandable to the system, so that
searching for sources doesn't error out quite so often
(e.g. in error handlers)
** provided a suitable readtable for reading in the source
files when necessary, and a mechanism for activating
this readtable rather than the standard one.
* Some work on conditions emitted by the system
** eliminated COMPILER-WARN and COMPILER-STYLE-WARN, which
were simply limited versions of WARN and STYLE-WARN.
** made STYLE-WARN parallel WARN more closely (by accepting
a condition type, which should be a subtype of
STYLE-WARNING, and initargs, as well as a format
string and format arguments for SIMPLE-STYLE-WARNING.
(WARN can also be used to signal STYLE-WARNINGs, but
STYLE-WARN helps to document the code)
** eliminated use of INHIBIT-WARNINGS by code emitted by the
system from user code.
** caused use of INHIBIT-WARNINGS to signal a STYLE-WARNING.
** eliminated use of INHIBIT-WARNINGS within the system
** deprecated INHIBIT-WARNINGS, causing its use to signal a
full WARNING.
** began work on developing a class hierarchy of conditions
along semantic lines.
** annotated conditions emitted by the system to have
references to documentation where applicable, so that
users can easily find an explanation for the
conditions they're seeing.
=======================================================================
for 0.9:
[ note: much of the below refers to preparation for merging SB-PCL:FOO
and CL:FOO. However, it turned out to be surprisingly
straightforward to do this notional end goal without doing many of
the preparatory operations. That doesn't mean that plenty of the
goals below aren't worthwhile, but the motivation is somewhat
different. ]
* refactored in preparation for moving CLOS into cold init and merging
SB-PCL:FOO with CL:FOO (for FOO=CLASS, FOO=CLASS-OF, etc.)
** systematized support for MOP (more regression tests, maybe)
to try to make sure things don't get mislaid in the
upcoming CLOS restructuring
** extracted type system (and maybe CLASSOIDs) from SB-KERNEL
into new SB-TYPE package
** reimplemented GENERIC-FUNCTION as a primitive object (or
maybe made SB-MOP:FUNCALLABLE-STANDARD-OBJECT the
primitive object, and then let GENERIC-FUNCTIONs
inherit from that) instead of structures with
:ALTERNATE-METACLASS and funcallableness. Now
FUNCALLABLE-INSTANCE can go away. (And now the new
funcallable primitive objects need to go into
collections like *FUN-HEADER-WIDETAGS* where
FUNCALLABLE-INSTANCE objects used to be.)
** reimplemented CONDITIONs as primitive objects instead of
structures with :ALTERNATE-METACLASS. Now (between
this and the change to GENERIC-FUNCTIONs)
DEFSTRUCT :ALTERNATE-METACLASS can go away.
** (maybe) Now INSTANCE_POINTER_LOWTAG can become just
STRUCTURE_POINTER_LOWTAG, and the concept of
SB-KERNEL:INSTANCE (including INSTANCEP,
(SPECIFIER-TYPE 'INSTANCE), etc.) can go away.
* moved CLOS into cold init, in order to allow CLOS to be used in the
implementation of the core system (e.g. the type system and the
compiler) and in order to support merger of CL:CLASS with
SB-PCL:CLASS
* (maybe) eliminated warm init altogether in favor of cold init
* (maybe, especially if warm init can be eliminated) rationalized
the build process, fixing miscellaneous pre-0.5.0 stuff that's
transparently not the right thing
** removed separate build directories, now just building in
place with .sbclcoldfasl extensions
* (maybe) more refactoring in preparation for merging SB-PCL:FOO
into CL:FOO: reimplemented type system OO dispatch
(!DEFINE-TYPE-METHOD, etc.) in terms of CLOS OO dispatch
* added some automatic tests for basic binary compatibility, in hopes
that it might be practical to maintain binary compatibility
between minor maintenance releases on the stable branch (but no
promises, sorry, since I've never tried to do this before, and
have no idea how much of a pain this'll be)
========================================================================
for 1.0 (fixes of lower priority which I'd nonetheless be embarrassed
to leave unfixed in 1.0):
* all too many BUGS entries and FIXMEs
=======================================================================
other priorities, no particular time:
* bug fixes, especially really annoying bugs (ANSI or not) and any
ANSI bugs (i.e. not just bugs in extras like the debugger or
"declarations are assertions", but violations of the standard)
* better communication with the outside world (scratching WHN's
personal itch): I don't want socket-level stuff so much as I
want RPC-level or higher (CORBA?) interfaces and (possibly
through RPC or CORBA) GUI support
* Especially when ldb is not compiled in, the default "assertion failed"
behaviour in many parts of the runtime is unfriendly. It may
be appropriate to look at some of these and see if they can be
handled in some less abrupt way than aborting
=======================================================================
important but out of scope (for WHN, anyway: Patches from other people
are still welcome!) until after 1.0:
* DYNAMIC-EXTENT
* sadly deteriorated support for ANSI-style block compilation
(static linking of DEFUNs within a single file or
WITH-COMPILATION-UNIT)
* various GC issues (exuberant cut-and-paste coding,
possibly dangerously over-conservative handling
of neighbors of function objects, general GC efficiency)
* package issues other than SB!TYPE, SB!MOP, and dead exported
symbols
* Any systematic effort to fix compiler consistency checks is
out of scope. (However, it still might be possible to
determine that some or all of them are hopelessly stale
and delete them.)
=======================================================================
other known issues with no particular target date:
bugs listed on the man page
hundreds of FIXME notes in the sources from WHN
various other unfinished business from CMU CL and before, marked with
"XX" or "XXX" or "###" or "***" or "???" or "pfw" or "@@@@" or "zzzzz"
or probably also other codes that I haven't noticed or have forgotten.
(Things marked as KLUDGE are in general things which are ugly or
confusing, but that, for whatever reason, may stay that way
indefinitely.)
=======================================================================
"There's nothing an agnostic can't do as long as he doesn't know
whether he believes in anything or not."
-- Monty Python.
"God grant me serenity to accept the code I cannot change, courage to
change the code I can, and wisdom to know the difference."
-- Erik Naggum
"Accumulation of half-understood design decisions eventually chokes a
program as a water weed chokes a canal. By refactoring you can ensure
that your full understanding of how the program should be designed is
always reflected in the program. As a water weed quickly spreads its
tendrils, partially understood design decisions quickly spread their
effects throughout your program. No one or two or even ten individual
actions will be enough to eradicate the problem."
-- Martin Fowler, in _Refactoring: Improving the Design of Existing
Code_, p. 360
"I wish I didn't know now what I didn't know then."
-- Bob Seger